Process for producing polyether polyols

US6670406B2 · kind B2 · utility

Assignees

• BAYER HEALTHCARE LLC · DE
• Bayer Polymers LLC · US

Inventors

• Jörg Hofmann · Krefeld, DE
• Stephan Ehlers · West Chester, US
• Bernd Klinksiek · Bensberg, DE
• Bert Klesczewski · Neunburg vorm Wald, DE
• Christian Steinlein · Ratingen, DE
• Lars Obendorf
• Harald Pielartzik · Pittsburgh, US
• Jose F. Pazos · Havertown, US

Key dates

• Filing date: Feb 19, 2002
• Grant date: Dec 30, 2003
• Expiry date: Jul 1, 2022

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G65/2696
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to a process for the production of a polyether polyol by polyaddition of an alkylene oxide onto a starter compound containing active hydrogen atoms conducted in the presence of a double metal cyanide catalyst comprising conducting a reaction mixture at least once through a zone which has an energy density of at least 5×106 J/m3, wherein the dwell time of the reaction mixture in this zone is at least 10−6 seconds per pass.